Posted: Sep 06, 2010 11:13 am
For anybody who wants to look at this stuff in more detail, I found a link to an online version of Rovelli's book. It doesn't have the very latest stuff it it, but has a lot of the arguments leading up to it:
http://www.cpt.univ-mrs.fr/~rovelli/book.pdf
http://www.cpt.univ-mrs.fr/~rovelli/book.pdf